Lab 3: Chromatography

Chromatography

Questions:

1. Why is it important that only the wick and not the filter paper circle be in contact with the water in the cup?

It is important so the the design can be created by having the water spread out and pull the ink and make it into different pigments and colors.

2. What are some of the variables that will affect the pattern of colors produced on the filler paper?

The variables that affected the pattern of the colors were the markers that we used, the design that was drawn onto the paper, and the amount of time it was in water. 

3. Why does each ink separate into different pigment bands?

The ink separates because each color dye has its own properties like water solubility making it so that  it will go onto the filter paper more or less.

4. Choose one color that is present in more than one type of ink. Is the pigment that gives this color always the same? Do any pens appear to contain common pigments? Explain.

Blue was present in most types of the ink. The pigment that gives this color is always the same because there is a common ingredient in the black ink of multiple water-soluble pens meaning it will show up in multiple pieces of chromatography. Yellow and pink appear to be another common pigment through the chromatography because of the similar ingredients in the pens and markers. 

5. Why are only water-soluble markers or pens used in this activity? How could the experiment be modified to separate the pigments in "permanent" markers or pens? 

Water soluble markers and pens were used in this activity so the ink could be carried throughout the filter paper making a design and pigment. Permanent markers would not work in this experiment because water does not make the ink from the permanent marker spread through the filler paper. To separate the pigments in permanent markers or pens we would have to change the solvent to one that would react with the permanent marker like rubbing alcohol or nail polish remover.

 

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